//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package com.springcloud.myRule;

import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AbstractLoadBalancerRule;
import com.netflix.loadbalancer.ILoadBalancer;
import com.netflix.loadbalancer.Server;

import java.util.List;
import java.util.concurrent.ThreadLocalRandom;

public class LRandomRule extends AbstractLoadBalancerRule {

   //每个机器访问五次,换下一个服务(3)
    //total=0 总数默认为0,如果等于五,我们指向下一个服务节点
  //index=0 默认0,如果total=5,index+1,
 private  int total=0; //被调用的次数
    private  int currentIndex = 0; //当前是谁在提供服务
    public  LRandomRule(){


    }

  //  @SuppressWarnings({"RCN_REDUNDANT_NULLCHECK_OF_NULL_VALUE"})
    public Server choose(ILoadBalancer lb, Object key) {
        if (lb == null) {
            return null;
        } else {
            Server server = null;

            while(server == null) {
                if (Thread.interrupted()) {
                    return null;
                }

                List<Server> upList = lb.getReachableServers(); //获得活着的服务
                List<Server> allList = lb.getAllServers(); //获得全部的服务
                int serverCount = allList.size();
                if (serverCount == 0) {
                    return null;
                }

//                int index = this.chooseRandomInt(serverCount); //生成区间随机数
//                server = (Server)upList.get(index); //从活着的服务中,随机获取一个
    //***************************************************************************
                if (total<5){
                   server =upList.get(currentIndex);
                   total++;
                }else {
                    total=0;
                    currentIndex++;
                    if (currentIndex>upList.size()){
                        currentIndex=0;
                    }
                    server= upList.get(currentIndex); //从活着的服务中,获取指定的服务来进行操作
                }


    //*********************************************************************************
                if (server == null) {
                    Thread.yield();
                } else {
                    if (server.isAlive()) {
                        return server;
                    }

                    server = null;
                    Thread.yield();
                }
            }

            return server;
        }
    }

    protected int chooseRandomInt(int serverCount) {
        return ThreadLocalRandom.current().nextInt(serverCount);
    }

    public Server choose(Object key) {
        return this.choose(this.getLoadBalancer(), key);
    }

    public void initWithNiwsConfig(IClientConfig clientConfig) {
    }
}
